I always wondered what I would do if held at gun or knife point and trying to distract someone long enough to draw and fire. I came to the conclusion that a good tactic would be to pretend to look over/behind them, as if you just noticed someone walking up behind the guy. There's a very good chance they are going to turn their head to see what you are looking at, possibly in fear of police or one of your buddies coming up behind them, this could give you just enough time to draw and get a shot or two off. I also like the wiggling fingers trick some of you mentioned, pretty clever.